WinForms Combo Box Flickering Issue
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- C#
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Description
### .NET version
10.0
### Did it work in .NET Framework?
No
### Did it work in any of the earlier releases of .NET Core or .NET 5+?
No
### Issue description
When the mouse moves over the combo box, an extra white box is drawn in the input area of the combo box, resulting in a flickering effect.
### Steps to reproduce
1. Create Winforms .NET app with ComboBox
2. Set comboBox1.FlatStyle = FlatStyle.Popup or comboBox1.FlatStyle = FlatStyle.Flat
3. Move the mouse over the combo box, a flickering effect occurs.
The original bug: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2053861
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Assessment
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